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This would require a spell to trigger and since we cannot makes spells we'd have to use another which is tricky and hard to do by replacing NPCs, etc. BG queuers are all set from within the game. You can flag them as a battlemasters or a trainer, but in the DBC files it defines exactly what BG they queue for (I discovered this when making 4.2 for AV).
This would involve a lot of scripting, quest writing, etc, etc and I'm sure the whole summon thing just would not work out well, especially in certain zones or arena if not disabled there.
I'm looking into a C++ scripted teleporter for raids at the moment, probably will come with 4.3.
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